Nationalism needs to go. There is absolutely nothing honorable in it. It just creates an artificial divide between the peoples of this planet. It all stems from a time when tribalism was needed to survive, and as it happens, evolution optimizes for local problems on the evolutionary curve and some of these features never go away.
Don't get me wrong, I am not saying we shouldn't cherish our cultural differences. On the contrary, I believe diversity is a wonderful thing and I find it fascinating that nearly every group of people out there has devised their own ways of communication, worship etc. Just don't let that devolve into "we are better than them", as it usually happens.
Did I ever say that? If I did, please point out where.
Absence of one type of divide doesn't imply that there wouldn't be others. But the less the better.